Download ASL INTERCOM PS 130 User manual

8.0
PARTY LINE, TECHNICAL CONCEPT
ASL's PRO Series offers a complete two way ('full duplex')
communications system.
Users of the system are connected via a 'party line'.
Master stations (with built-in power supply), beltpacks,
speaker stations and power supplies are interconnected
via standard microphone cable. One wire is used as an
audio line, one as a power line and the screen of the cable
functions as earth/return.
Current drive is used for signal transfer. Each station
utilises a current amplifier to amplify the microphone signal
and place it on the common audio line where, due to the
constant line impedance (situated in the power supply
between XLR pin 3 and 1), a signal voltage is developed
which can be further amplified and sent to headphones or
loudspeakers.
This principle has three advantages:
- the use of a single audio line allows several stations to
talk and listen simultaneously.
- due to the high bridging impedance offered by each
station, the number of stations 'on line' has no
influence on the level of the communications signal.
- power and audio to the intercom stations use the same
cable.
The Call signal is also sent as a current on the audio line.
It develops a DC potential over the line impedance which
will be sensed by each station and interpreted as a Call
signal.
9.0
GUARANTEE
This unit is warranted by ASL Intercom to the original enduser purchaser against defects in workmanship and
materials in it's manufacture for a period of one year from
date of shipment to the end-user.
Faults arising from misuse, unauthorised modifications or
accidents are not covered by this warranty. If the unit is
faulty it should be sent in it's original packing, to the
supplier or your local ASL dealer, with shipping prepaid. A
note must be included stating the faults found and a copy
of the original suppliers invoice.
10.0 TECHNICAL SPECIFICATIONS PS 130
POWER CONSUMPTION
current (at 30 V DC)
35 mA quiescent
70 mA signalling
190 mA at max. output + signalling
MIC. PREAMP
gooseneck microphone type
noise cancelling electret
headset mic. impedance
200 ohms
gain
40 dB - 70 dB (adjustable internally)
presence filter
+6 dB at 5 kHz
frequency response
200 Hz - 13 kHz (-3 dB)
V electret mic
+9 V DC
HEADPHONES DRIVER AMP
max. load
max. output level
max. output power
200 ohms
14 V rms (200 ohms)
0.5 W rms (each can)
SPEAKER DRIVER AMP
speaker impedance
max. output power
INTERCOM LINE DRIVER
max. output current
output impedance
SIDETONE
rejection
BUZZER
max. SPL
DIMENSIONS AND WEIGHT
width
height
depth
weight
50 ohms
1.3 W rms
3 mA rms
> 150 Kohms
0 - 30dB adjustable
100 dBA
230 mm
88 mm
42/48 mm sloping
1.1 Kg
GENERAL SYSTEM SPECIFICATIONS
intercom line impedance
350 ohms (1kHz)
2.2 Kohms (DC)
intercom line audio level
nom. -18 dBu
max. +4 dBu
dynamic range
80 dB
call send signal
+2.8 mA
call receive signal threshold
+2.4 V DC
supply voltage
+30 V DC (12 V to 32 V)
mic mute power interrupt time
0.1 sec
Note: 0 dBu = 775 mV into open circuit
THIS PRODUCT WAS DESIGNED, DEVELOPED AND
MANUFACTURED BY:
ASL reserves the right to alter specifications without further
notice.
AMPCO SOUND LAB BV
MAARSSEN (UTRECHT) HOLLAND.
User Manual PS 130 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.
7